How to know, whether HiDPI is supported?

[Eirik Bakke]

This did the trick for me:

// g is the Graphics2D object fed to the paint() or paintComponent()
method of your Swing component.
g.getFontRenderContext().getTransform().equals(AffineTransform.getScaleInst
ance(2.0, 2.0))


It uses no private APIs, and has the advantage that it lets you make the
retina-or-not decision on a component-to-component basis (or in practice,
on a window-to-window basis, as all components in the same window have the
same FontRenderContext). This means if your user has one window on their
retina laptop screen and another on their non-retina external monitor,
both will render appropriately for their respective devices (I've
confirmed this to work on Java 1.7.0_45 for MacOS X 10.8.5).

-- Eirik

On 11/29/13, 7:36 AM, "Hendrik Schreiber" <hs at tagtraum.com> wrote:

>Hey..
>
>with some of the Retina work appearing in 1.7.0_60, what is the
>recommended way for the developer to find out, whether images are/can be
>scaled, i.e., whether we are dealing with a HiDPI display.
>
>In the past, on the Apple JVM, we used:
>
>	final Float scaleFactor = (Float)
>Toolkit.getDefaultToolkit().getDesktopProperty("apple.awt.contentScaleFact
>or");
>
>Is there an equivalent?
>
>I very much appreciate that you are pushing some of the work down to
>1.7.0_60. Can you say what parts should now/soon work and how to use them?
>
>Thank you,
>
>-hendrik